The Effect of Perturbations on Resistance to Sliding in Second Order Moments Using Conventional Ligated Brackets Versus Passive Self Ligated Brackets

  • Author / Creator
    Wong,Justin K
  • Abstract Objectives: A novel frictional and perturbation device was used to investigate the role of vibrations on resistance to sliding (RS) in conventional and passive ligated brackets Methods: 150 3M Victory Series twins (0.022 slot) and 150 Damon Q brackets (0.022 slot) were tested using an 18 x 25 stainless steel wire for resistance to sliding. Test groups consisted of equal numbers (n=30) representing combinations of high and low amplitude and frequency of perturbations as well as control. Second order angulation tested ranged from 0 to 6 degrees. Results: Bracket type, perturbation test condition, and interactions were all significant in affecting resistance to sliding. High Perturbations reduces RS more than low perturbations independent of frequency. Conclusions: Passive ligated brackets have a lower resistance to sliding when compared to conventional ligated brackets under all test conditions and angulations. Amplitude of perturbations has a larger role than frequency in reduction of RS.

  • Subjects / Keywords
  • Graduation date
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
  • Institution
    University of Alberta
  • Degree level
  • Department
    • Medical Sciences-Orthodontics
  • Specialization
    • Orthodontics
  • Supervisor / co-supervisor and their department(s)
    • Toogood,Roger (Mechanical Engineering)
    • Major,Paul (Dentistry)
  • Examining committee members and their departments
    • Heo,Giseon (Dentistry)
    • Carey,Jason (Mechanical Engineering)
    • Flores-Mir,Carlos (Dentistry)